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Retirement Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
United States Pension Plans of US Entity, Defined Benefit
 
Defined Benefit Plan Disclosure  
Contribution to defined benefit pension plans $ 0.9
Foreign Pension Plans, Defined Benefit
 
Defined Benefit Plan Disclosure  
Contribution to defined benefit pension plans $ 1.0